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Pro vs open source version

Pro and open source versions are separate products


New version available

This v2 document is obsolete. Please see the current v3 document here.

FingerprintJS Pro was started in the beginning of 2019 when the creator of the original FingerprintJS took feedback from existing open-source users to implement a new professional version.

Since 2012, FingerprintJS was used by thousands of companies on a traffic scale of billions of users.

The new Pro version is a commercially developed platform for fraud detection, anonymous user identification, and traffic analysis that has numerous advantages, compared with the open source version.

The differences between the open source and Pro versions are summarized in the table below.

FeatureOpen SourcePRO
Browser fingerprintingBasicAdvanced
Anonymous user identificationNoYes
Fraud detectionNoYes
Incognito / Private mode detectionNoYes

Pro version is a server-side analysis API

The main difference between the open source and the pro version is that the open source version is only a JavaScript file that queries browser attributes and computes a hash from them (performs fingerprinting). In a situation with identical browsers, it will generate identical fingerprints. If two different users use the same browser (same vendor and version) on the same phone model, you will get two identical fingerprints and will not be able to tell these two users apart.

To solve this, the Pro version processes the identification data on the server. In addition to regular fingerprinting, it analyzes vast amounts of auxiliary data (IP addresses, time of visit patterns, URL changes and more) to be able to reliably deduplicate different users that have identical devices.

Other differences between Pro and open source versions are explained below (click on a link in the summary table to visit a dedicated help page).


Open source: generates the fingerprints directly in the browser, which makes it vulnerable to spoofing and reverse engineering.

Pro: processes all the information server-side and transmits it securely to you servers using server-to-server APIs. Information is never exposed in the browser, which makes it much harder to tamper with. All the information that is collected is never shared with 3rd parties. The security of your data is our priority.


Open source: provides no SLA or any guarantees.

Pro: provides a 99.9% uptime/availability monthly SLA.


Open source: only GitHub issues/questions with no response time guarantee.

Pro: provides guaranteed same business day response.
Enterprise support options are available on request.

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